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	<div id="pagetitle"><h1>YUI Library Examples: IO: Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</h1></div>
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	<h2>IO: Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</h2>

	<div id="example" class="promo">
	<div class="example-intro">
	<p>In the example below, IO is employed to make a cross-domain request to <a href="http://pipes.yahoo.com">Yahoo! Pipes</a>.  The output of the Pipe is an RSS-style feed formatted as JSON.  We pass that output to the JSON Utility's <code>parse</code> method for sanitization and then display the contents of the Pipe in a list.</p>

<p>The cross-domain approach obviates the need for a server-side proxy, making it faster. And the use of IO in place of a script node allows us to retrieve the JSON data as a string and execute <code>JSON.parse</code> against it, making it safer to use; a script node would evaluate immediately in the global scope as soon as it was loaded.</p>	</div>

	<div class="module example-container ">
			<div class="hd exampleHd">
			<p class="newWindowButton yui-skin-sam">
                <a href="io-xdr_clean.html" target="_blank">View example in new window.</a>
            </p>
		</div>		<div id="example-canvas" class="bd">

	
	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->

	<button id="fetch" disabled="disabled">Load JSON RSS news feed from Yahoo! Pipes.</button>

<div id="output">
	<ul>
		<li>Content from Yahoo! Pipes feed will display here.</li>
    </ul>
</div>

<script language="javascript">

YUI({ filter: 'raw' }).use("io-xdr", "substitute", "json-parse", "node",

	function(Y) {

		//Data fetched will be displayed in a UL in the
		//element #output:
		var output = Y.one("#output ul");

		//Configure the cross-domain protocol:
		var xdrConfig = {
			id:'flash', //We'll reference this id in the xdr configuration of our transaction.
			src:'../../build/io/io.swf' //Relative path to the .swf file from the current page.
		};
		Y.io.transport(xdrConfig);

		//Event handler called when the transaction begins:
		var handleStart = function(id, a) {
			Y.log("io:start firing.", "info", "example");
			output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
		}

		//Event handler for the success event -- use this handler to write the fetched
		//RSS items to the page.
		var handleSuccess = function(id, o, a) {

			//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
			//it into the page):
			var oRSS = Y.JSON.parse(o.responseText);

			//From here, we simply access the JSON data from where it's provided
			//in the Yahoo! Pipes output:
			if (oRSS && oRSS.count) {

				var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
					//t in this case is our simple template; this is fed to
					//Y.Lang.substitute as we loop through RSS items:
					t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";

				for (var i=0; i<oRSS.count; i++) {
					s += Y.Lang.substitute(t, oRSS.value.items[i]);
				}

				//Output the string to the page:
				output.set("innerHTML", s);
				output.addClass("yui-null");

			} else {
				//No news stories were found in the feed.
				var s = "<li>The RSS feed did not return any items.</li>";
			}
		}

		//In the event that the HTTP status returned is > 399, a
		//failure is reported and this function is called:
		var handleFailure = function(id, o, a) {
			Y.log("ERROR " + id + " " + a, "info", "example");
		}

		//With all the aparatus in place, we can now configure our
		//io call.
		var cfg = {
			method: "GET",
			xdr: {
				use:'flash' //This is the xdrConfig id we referenced above.
			},
			on: {
				//Our event handlers previously defined:
				start: handleStart,
				success: handleSuccess,
				failure: handleFailure
			}
		};

		//Wire the buttton to a click handler to fire our request each
		//time the button is clicked:
		var handleClick = function(o) {
			Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
			var obj = Y.io(
				//this is a specific Pipes feed, populated with cycling news:
				"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
				cfg
			);
		}

		//add the clickHandler as soon as the xdr Flash module has
		//loaded:
		Y.on('io:xdrReady', function() {
			var fetch = Y.one("#fetch");
			fetch.set("disabled", false);
			Y.on("click", handleClick, fetch);
		});

	}
);
</script>
	<!--END SOURCE CODE FOR EXAMPLE =============================== -->

	
		</div>
	</div>
	</div>

	<h2 class="first">Implementing a Simple Cross-Domain Request for JSON Data</h2>

<p>In this example, we begin with a YUI instance that loads the <code>io-xdr</code>, <code>json-parse</code>, <code>substitute</code> and <code>node</code> modules. The <code>io-xdr</code> module is the key module. The other modules are used to process and output the results:</p>

<div id="syntax-ebc2e5b39cbb76f840b5a67a773b3907" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//Create a YUI instance including support for IO and JSON modules:</span></div></li><li class="li1"><div class="de1">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;io-xdr&quot;</span><span class="sy0">,</span> <span class="st0">&quot;substitute&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span> <span class="st0">&quot;node&quot;</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">	<span class="co1">// Y is the YUI instance.</span></div></li><li class="li1"><div class="de1">	<span class="co1">// The rest of the following code is encapsulated in this</span></div></li><li class="li2"><div class="de2">	<span class="co1">// anonymous function.</span></div></li><li class="li1"><div class="de1"><span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//Create a YUI instance including support for IO and JSON modules:</span>
YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;io-xdr&quot;</span><span class="sy0">,</span> <span class="st0">&quot;substitute&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span> <span class="st0">&quot;node&quot;</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span>
	<span class="co1">// Y is the YUI instance.</span>
	<span class="co1">// The rest of the following code is encapsulated in this</span>
	<span class="co1">// anonymous function.</span>
<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-ebc2e5b39cbb76f840b5a67a773b3907-plain">//Create a YUI instance including support for IO and JSON modules:
YUI().use("io-xdr", "substitute", "json-parse", "node", function(Y) {
	// Y is the YUI instance.
	// The rest of the following code is encapsulated in this
	// anonymous function.
});</textarea></div><p>We'll also get a Node reference to the container we'll be using to output the data we retrieve:</p>

<div id="syntax-edd10b243b696c650f4a6da1b1e71ffe" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//element #output:</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#output ul&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//element #output:</span>
<span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#output ul&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-edd10b243b696c650f4a6da1b1e71ffe-plain">//element #output:
var output = Y.one("#output ul");</textarea></div>
<p>Next, we configure IO's cross-domain interface for this YUI instance.  Flash is the underlying mechansim used here.  Be sure to configure the <code>src</code> property to point to your <code>IO.swf</code> file.</p>

<div id="syntax-e8525edf73d56fc0def976cd66427503" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//Configure the cross-domain protocol:</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">    id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span></div></li><li class="li1"><div class="de1">    src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf //Relative path to the .swf file from the current page.</span></div></li><li class="li2"><div class="de2"><span class="st0">};</span></div></li><li class="li1"><div class="de1"><span class="st0">Y.io.transport(xdrConfig);</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//Configure the cross-domain protocol:</span>
<span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">&#123;</span>
    id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span>
    src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf //Relative path to the .swf file from the current page.
};
Y.io.transport(xdrConfig);</span></pre></div><textarea id="syntax-e8525edf73d56fc0def976cd66427503-plain">//Configure the cross-domain protocol:
var xdrConfig = {
    id:'flash', //We'll reference this id in the xdr configuration of our transaction.
    src:'../../build/io/io.swf //Relative path to the .swf file from the current page.
};
Y.io.transport(xdrConfig);</textarea></div>
<p>The configuration for our specific IO transaction contains a reference to the <code>xdr</code> configuration we created above and specifies that there will not be a need to process the response as XML (we're getting JSON instead):</p>

<div id="syntax-83ecd06ca3fd1bc150149efc7f252ccb" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">    method<span class="sy0">:</span> <span class="st0">&quot;GET&quot;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    xdr<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">        <span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span></div></li><li class="li2"><div class="de2">    <span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    on<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">        <span class="co1">//Our event handlers previously defined:</span></div></li><li class="li1"><div class="de1">        start<span class="sy0">:</span> handleStart<span class="sy0">,</span></div></li><li class="li1"><div class="de1">        success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span></div></li><li class="li2"><div class="de2">        failure<span class="sy0">:</span> handleFailure</div></li><li class="li1"><div class="de1">    <span class="br0">&#125;</span></div></li><li class="li1"><div class="de1"><span class="br0">&#125;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">&#123;</span>
    method<span class="sy0">:</span> <span class="st0">&quot;GET&quot;</span><span class="sy0">,</span>
    xdr<span class="sy0">:</span> <span class="br0">&#123;</span>
        <span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span>
    <span class="br0">&#125;</span><span class="sy0">,</span>
    on<span class="sy0">:</span> <span class="br0">&#123;</span>
        <span class="co1">//Our event handlers previously defined:</span>
        start<span class="sy0">:</span> handleStart<span class="sy0">,</span>
        success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span>
        failure<span class="sy0">:</span> handleFailure
    <span class="br0">&#125;</span>
<span class="br0">&#125;</span><span class="sy0">;</span></pre></div><textarea id="syntax-83ecd06ca3fd1bc150149efc7f252ccb-plain">var cfg = {
    method: "GET",
    xdr: {
        use:'flash', //This is the xdrConfig id we referenced above.
    },
    on: {
        //Our event handlers previously defined:
        start: handleStart,
        success: handleSuccess,
        failure: handleFailure
    }
};</textarea></div>
<p>The final step is to make the request:</p>

<div id="syntax-23c8f0b3b2c326f3f1f65ab5390dfc84" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span></div></li><li class="li1"><div class="de1">    <span class="co1">//this is a specific Pipes feed, populated with cycling news:</span></div></li><li class="li1"><div class="de1">    <span class="st0">&quot;http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&amp;_render=json&quot;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">    cfg</div></li><li class="li2"><div class="de2"><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span>
    <span class="co1">//this is a specific Pipes feed, populated with cycling news:</span>
    <span class="st0">&quot;http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&amp;_render=json&quot;</span><span class="sy0">,</span>
    cfg
<span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-23c8f0b3b2c326f3f1f65ab5390dfc84-plain">var obj = Y.io(
    //this is a specific Pipes feed, populated with cycling news:
    "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
    cfg
);</textarea></div>
<h3>Full Script</h3>

<p>The full script source for this example is as follows:</p>

<div id="syntax-8abcea2ed86713f00a60ac64e8da00f2" class="yui-syntax-highlight yui-syntax-highlight-linenumbers"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;io-xdr&quot;</span><span class="sy0">,</span> <span class="st0">&quot;substitute&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span> <span class="st0">&quot;node&quot;</span><span class="sy0">,</span> </div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">	<span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">		<span class="co1">//Data fetched will be displayed in a UL in the</span></div></li><li class="li1"><div class="de1">		<span class="co1">//element #output:</span></div></li><li class="li1"><div class="de1">		<span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#output ul&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//Configure the cross-domain protocol:</span></div></li><li class="li2"><div class="de2">		<span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">			id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span></div></li><li class="li1"><div class="de1">			src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf'</span> <span class="co1">//Relative path to the .swf file from the current page.</span></div></li><li class="li1"><div class="de1">		<span class="br0">&#125;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">		Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">&#40;</span>xdrConfig<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//Event handler called when the transaction begins:</span></div></li><li class="li1"><div class="de1">		<span class="kw2">var</span> handleStart <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;io:start firing.&quot;</span><span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">			output.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;innerHTML&quot;</span><span class="sy0">,</span> <span class="st0">&quot;&lt;li&gt;Loading news stories via Yahoo! Pipes feed...&lt;/li&gt;&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">		<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//Event handler for the success event -- use this handler to write the fetched</span></div></li><li class="li1"><div class="de1">		<span class="co1">//RSS items to the page.</span></div></li><li class="li1"><div class="de1">		<span class="kw2">var</span> handleSuccess <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">			<span class="co1">//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing</span></div></li><li class="li1"><div class="de1">			<span class="co1">//it into the page):</span></div></li><li class="li1"><div class="de1">			<span class="kw2">var</span> oRSS <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">&#40;</span>o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">			<span class="co1">//From here, we simply access the JSON data from where it's provided</span></div></li><li class="li1"><div class="de1">			<span class="co1">//in the Yahoo! Pipes output:</span></div></li><li class="li1"><div class="de1">			<span class="kw1">if</span> <span class="br0">&#40;</span>oRSS <span class="sy0">&amp;&amp;</span> oRSS.<span class="me1">count</span><span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">				<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">&quot;&lt;!--begin news stories fetched via Yahoo! Pipes--&gt;&quot;</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2">					<span class="co1">//t in this case is our simple template; this is fed to</span></div></li><li class="li1"><div class="de1">					<span class="co1">//Y.Lang.substitute as we loop through RSS items:</span></div></li><li class="li1"><div class="de1">					t <span class="sy0">=</span> <span class="st0">&quot;&lt;li&gt;&lt;a href='{link}'&gt;{title}&lt;/a&gt;, {pubDate}&lt;/li&gt;&quot;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">				<span class="kw1">for</span> <span class="br0">&#40;</span><span class="kw2">var</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0">&lt;</span>oRSS.<span class="me1">count</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li2"><div class="de2">					s <span class="sy0">+=</span> Y.<span class="me1">Lang</span>.<span class="me1">substitute</span><span class="br0">&#40;</span>t<span class="sy0">,</span> oRSS.<span class="me1">value</span>.<span class="me1">items</span><span class="br0">&#91;</span>i<span class="br0">&#93;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">				<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">				<span class="co1">//Output the string to the page:</span></div></li><li class="li1"><div class="de1">				output.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;innerHTML&quot;</span><span class="sy0">,</span> s<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">			<span class="br0">&#125;</span> <span class="kw1">else</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">				<span class="co1">//No news stories were found in the feed.</span></div></li><li class="li1"><div class="de1">				<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">&quot;&lt;li&gt;The RSS feed did not return any items.&lt;/li&gt;&quot;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">			<span class="br0">&#125;</span></div></li><li class="li2"><div class="de2">		<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//In the event that the HTTP status returned is &gt; 399, a</span></div></li><li class="li1"><div class="de1">		<span class="co1">//failure is reported and this function is called:</span></div></li><li class="li1"><div class="de1">		<span class="kw2">var</span> handleFailure <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li2"><div class="de2">			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;ERROR &quot;</span> <span class="sy0">+</span> id <span class="sy0">+</span> <span class="st0">&quot; &quot;</span> <span class="sy0">+</span> a<span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">		<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//With all the aparatus in place, we can now configure our</span></div></li><li class="li1"><div class="de1">		<span class="co1">//io call.</span></div></li><li class="li2"><div class="de2">		<span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">			method<span class="sy0">:</span> <span class="st0">&quot;GET&quot;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">			xdr<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">				<span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span></div></li><li class="li1"><div class="de1">				<span class="co1">//Set property &quot;dataType&quot; with a value of &quot;xml&quot; if the response</span></div></li><li class="li2"><div class="de2">				<span class="co1">//type is an XML document, when using the Flash transport.</span></div></li><li class="li1"><div class="de1">			<span class="br0">&#125;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">			on<span class="sy0">:</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">				<span class="co1">//Our event handlers previously defined:</span></div></li><li class="li1"><div class="de1">				start<span class="sy0">:</span> handleStart<span class="sy0">,</span></div></li><li class="li2"><div class="de2">				success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span></div></li><li class="li1"><div class="de1">				failure<span class="sy0">:</span> handleFailure</div></li><li class="li1"><div class="de1">			<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1">		<span class="br0">&#125;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">&nbsp;</div></li><li class="li2"><div class="de2">		<span class="co1">//Wire the buttton to a click handler to fire our request each</span></div></li><li class="li1"><div class="de1">		<span class="co1">//time the button is clicked:</span></div></li><li class="li1"><div class="de1">		<span class="kw2">var</span> handleClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;Click detected; beginning io request to Yahoo! Pipes.&quot;</span><span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">			<span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span></div></li><li class="li2"><div class="de2">				<span class="co1">//this is a specific Pipes feed, populated with cycling news:</span></div></li><li class="li1"><div class="de1">				<span class="st0">&quot;http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&amp;_render=json&quot;</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1">				cfg</div></li><li class="li1"><div class="de1">			<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">		<span class="br0">&#125;</span></div></li><li class="li2"><div class="de2">&nbsp;</div></li><li class="li1"><div class="de1">		<span class="co1">//add the clickHandler as soon as the xdr Flash module has</span></div></li><li class="li1"><div class="de1">		<span class="co1">//loaded:</span></div></li><li class="li1"><div class="de1">		Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'io:xdrReady'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span><span class="br0">&#41;</span> <span class="br0">&#123;</span></div></li><li class="li1"><div class="de1">			<span class="kw2">var</span> fetch <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#fetch&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2">			fetch.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;disabled&quot;</span><span class="sy0">,</span> <span class="kw2">false</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">			Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">&quot;click&quot;</span><span class="sy0">,</span> handleClick<span class="sy0">,</span> fetch<span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">		<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">	<span class="br0">&#125;</span></div></li><li class="li1"><div class="de1"><span class="br0">&#41;</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">YUI<span class="br0">&#40;</span><span class="br0">&#41;</span>.<span class="kw2">use</span><span class="br0">&#40;</span><span class="st0">&quot;io-xdr&quot;</span><span class="sy0">,</span> <span class="st0">&quot;substitute&quot;</span><span class="sy0">,</span> <span class="st0">&quot;json-parse&quot;</span><span class="sy0">,</span> <span class="st0">&quot;node&quot;</span><span class="sy0">,</span> 
&nbsp;
	<span class="kw2">function</span><span class="br0">&#40;</span>Y<span class="br0">&#41;</span> <span class="br0">&#123;</span>
&nbsp;
		<span class="co1">//Data fetched will be displayed in a UL in the</span>
		<span class="co1">//element #output:</span>
		<span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#output ul&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
		<span class="co1">//Configure the cross-domain protocol:</span>
		<span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">&#123;</span>
			id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span>
			src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf'</span> <span class="co1">//Relative path to the .swf file from the current page.</span>
		<span class="br0">&#125;</span><span class="sy0">;</span>
		Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">&#40;</span>xdrConfig<span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
		<span class="co1">//Event handler called when the transaction begins:</span>
		<span class="kw2">var</span> handleStart <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span>
			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;io:start firing.&quot;</span><span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
			output.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;innerHTML&quot;</span><span class="sy0">,</span> <span class="st0">&quot;&lt;li&gt;Loading news stories via Yahoo! Pipes feed...&lt;/li&gt;&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
		<span class="br0">&#125;</span>
&nbsp;
		<span class="co1">//Event handler for the success event -- use this handler to write the fetched</span>
		<span class="co1">//RSS items to the page.</span>
		<span class="kw2">var</span> handleSuccess <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span>
&nbsp;
			<span class="co1">//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing</span>
			<span class="co1">//it into the page):</span>
			<span class="kw2">var</span> oRSS <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">&#40;</span>o.<span class="me1">responseText</span><span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
			<span class="co1">//From here, we simply access the JSON data from where it's provided</span>
			<span class="co1">//in the Yahoo! Pipes output:</span>
			<span class="kw1">if</span> <span class="br0">&#40;</span>oRSS <span class="sy0">&amp;&amp;</span> oRSS.<span class="me1">count</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
&nbsp;
				<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">&quot;&lt;!--begin news stories fetched via Yahoo! Pipes--&gt;&quot;</span><span class="sy0">,</span>
					<span class="co1">//t in this case is our simple template; this is fed to</span>
					<span class="co1">//Y.Lang.substitute as we loop through RSS items:</span>
					t <span class="sy0">=</span> <span class="st0">&quot;&lt;li&gt;&lt;a href='{link}'&gt;{title}&lt;/a&gt;, {pubDate}&lt;/li&gt;&quot;</span><span class="sy0">;</span>
&nbsp;
				<span class="kw1">for</span> <span class="br0">&#40;</span><span class="kw2">var</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0">&lt;</span>oRSS.<span class="me1">count</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
					s <span class="sy0">+=</span> Y.<span class="me1">Lang</span>.<span class="me1">substitute</span><span class="br0">&#40;</span>t<span class="sy0">,</span> oRSS.<span class="me1">value</span>.<span class="me1">items</span><span class="br0">&#91;</span>i<span class="br0">&#93;</span><span class="br0">&#41;</span><span class="sy0">;</span>
				<span class="br0">&#125;</span>
&nbsp;
				<span class="co1">//Output the string to the page:</span>
				output.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;innerHTML&quot;</span><span class="sy0">,</span> s<span class="br0">&#41;</span><span class="sy0">;</span>
&nbsp;
			<span class="br0">&#125;</span> <span class="kw1">else</span> <span class="br0">&#123;</span>
				<span class="co1">//No news stories were found in the feed.</span>
				<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">&quot;&lt;li&gt;The RSS feed did not return any items.&lt;/li&gt;&quot;</span><span class="sy0">;</span>
			<span class="br0">&#125;</span>
		<span class="br0">&#125;</span>
&nbsp;
		<span class="co1">//In the event that the HTTP status returned is &gt; 399, a</span>
		<span class="co1">//failure is reported and this function is called:</span>
		<span class="kw2">var</span> handleFailure <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">&#41;</span> <span class="br0">&#123;</span>
			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;ERROR &quot;</span> <span class="sy0">+</span> id <span class="sy0">+</span> <span class="st0">&quot; &quot;</span> <span class="sy0">+</span> a<span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
		<span class="br0">&#125;</span>
&nbsp;
		<span class="co1">//With all the aparatus in place, we can now configure our</span>
		<span class="co1">//io call.</span>
		<span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">&#123;</span>
			method<span class="sy0">:</span> <span class="st0">&quot;GET&quot;</span><span class="sy0">,</span>
			xdr<span class="sy0">:</span> <span class="br0">&#123;</span>
				<span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span>
				<span class="co1">//Set property &quot;dataType&quot; with a value of &quot;xml&quot; if the response</span>
				<span class="co1">//type is an XML document, when using the Flash transport.</span>
			<span class="br0">&#125;</span><span class="sy0">,</span>
			on<span class="sy0">:</span> <span class="br0">&#123;</span>
				<span class="co1">//Our event handlers previously defined:</span>
				start<span class="sy0">:</span> handleStart<span class="sy0">,</span>
				success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span>
				failure<span class="sy0">:</span> handleFailure
			<span class="br0">&#125;</span>
		<span class="br0">&#125;</span><span class="sy0">;</span>
&nbsp;
		<span class="co1">//Wire the buttton to a click handler to fire our request each</span>
		<span class="co1">//time the button is clicked:</span>
		<span class="kw2">var</span> handleClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">&#40;</span>o<span class="br0">&#41;</span> <span class="br0">&#123;</span>
			Y.<span class="me1">log</span><span class="br0">&#40;</span><span class="st0">&quot;Click detected; beginning io request to Yahoo! Pipes.&quot;</span><span class="sy0">,</span> <span class="st0">&quot;info&quot;</span><span class="sy0">,</span> <span class="st0">&quot;example&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
			<span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">&#40;</span>
				<span class="co1">//this is a specific Pipes feed, populated with cycling news:</span>
				<span class="st0">&quot;http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&amp;_render=json&quot;</span><span class="sy0">,</span>
				cfg
			<span class="br0">&#41;</span><span class="sy0">;</span>
		<span class="br0">&#125;</span>
&nbsp;
		<span class="co1">//add the clickHandler as soon as the xdr Flash module has</span>
		<span class="co1">//loaded:</span>
		Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">'io:xdrReady'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">&#40;</span><span class="br0">&#41;</span> <span class="br0">&#123;</span>
			<span class="kw2">var</span> fetch <span class="sy0">=</span> Y.<span class="me1">one</span><span class="br0">&#40;</span><span class="st0">&quot;#fetch&quot;</span><span class="br0">&#41;</span><span class="sy0">;</span>
			fetch.<span class="me1">set</span><span class="br0">&#40;</span><span class="st0">&quot;disabled&quot;</span><span class="sy0">,</span> <span class="kw2">false</span><span class="br0">&#41;</span><span class="sy0">;</span>
			Y.<span class="me1">on</span><span class="br0">&#40;</span><span class="st0">&quot;click&quot;</span><span class="sy0">,</span> handleClick<span class="sy0">,</span> fetch<span class="br0">&#41;</span><span class="sy0">;</span>
		<span class="br0">&#125;</span><span class="br0">&#41;</span><span class="sy0">;</span>
	<span class="br0">&#125;</span>
<span class="br0">&#41;</span><span class="sy0">;</span></pre></div><textarea id="syntax-8abcea2ed86713f00a60ac64e8da00f2-plain">YUI().use("io-xdr", "substitute", "json-parse", "node", 

	function(Y) {

		//Data fetched will be displayed in a UL in the
		//element #output:
		var output = Y.one("#output ul");

		//Configure the cross-domain protocol:
		var xdrConfig = {
			id:'flash', //We'll reference this id in the xdr configuration of our transaction.
			src:'../../build/io/io.swf' //Relative path to the .swf file from the current page.
		};
		Y.io.transport(xdrConfig);

		//Event handler called when the transaction begins:
		var handleStart = function(id, a) {
			Y.log("io:start firing.", "info", "example");
			output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
		}

		//Event handler for the success event -- use this handler to write the fetched
		//RSS items to the page.
		var handleSuccess = function(id, o, a) {

			//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
			//it into the page):
			var oRSS = Y.JSON.parse(o.responseText);

			//From here, we simply access the JSON data from where it's provided
			//in the Yahoo! Pipes output:
			if (oRSS && oRSS.count) {

				var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
					//t in this case is our simple template; this is fed to
					//Y.Lang.substitute as we loop through RSS items:
					t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";

				for (var i=0; i<oRSS.count; i++) {
					s += Y.Lang.substitute(t, oRSS.value.items[i]);
				}

				//Output the string to the page:
				output.set("innerHTML", s);

			} else {
				//No news stories were found in the feed.
				var s = "<li>The RSS feed did not return any items.</li>";
			}
		}

		//In the event that the HTTP status returned is > 399, a
		//failure is reported and this function is called:
		var handleFailure = function(id, o, a) {
			Y.log("ERROR " + id + " " + a, "info", "example");
		}

		//With all the aparatus in place, we can now configure our
		//io call.
		var cfg = {
			method: "GET",
			xdr: {
				use:'flash', //This is the xdrConfig id we referenced above.
				//Set property "dataType" with a value of "xml" if the response
				//type is an XML document, when using the Flash transport.
			},
			on: {
				//Our event handlers previously defined:
				start: handleStart,
				success: handleSuccess,
				failure: handleFailure
			}
		};

		//Wire the buttton to a click handler to fire our request each
		//time the button is clicked:
		var handleClick = function(o) {
			Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
			var obj = Y.io(
				//this is a specific Pipes feed, populated with cycling news:
				"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
				cfg
			);
		}

		//add the clickHandler as soon as the xdr Flash module has
		//loaded:
		Y.on('io:xdrReady', function() {
			var fetch = Y.one("#fetch");
			fetch.set("disabled", false);
			Y.on("click", handleClick, fetch);
		});
	}
);</textarea></div>				</div>
				<div class="yui-u sidebar">
	
					<div id="examples" class="mod box4">
                        <div class="hd">
						<h4>
    IO Examples:</h4>
                        </div>
						<div class="bd">
							<ul>
								<li><a href='../io/io-get.html'>GET Transaction</a></li><li><a href='../io/io-post.html'>POST Transaction</a></li><li><a href='../io/io-weather.html'>XML Transaction &mdash; Retrieving a Yahoo! Weather RSS (XML) Feed via a Server-Side Proxy</a></li><li class='selected'><a href='../io/io-xdr.html'>Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</a></li><li><a href='../node-menunav/node-menunav-8.html'>Adding Submenus On The Fly (included with examples for MenuNav Node Plugin)</a></li><li><a href='../overlay/overlay-io-plugin.html'>IO Plugin (included with examples for Overlay)</a></li><li><a href='../dd/portal-drag.html'>Portal Style Example (included with examples for Drag &amp; Drop)</a></li>							</ul>
						</div>
					</div>

					<div class="mod box4">
                        <div class="hd">
						<h4>More IO Resources:</h4>
                        </div>
                        <div class="bd">
						<ul>
							<!-- <li><a href="http://developer.yahoo.com/yui/io/">User's Guide</a> (external)</li> -->
<li><a href="../../api/module_io.html">API Documentation</a></li></ul>
                        </div>
					</div>
			  </div>
		</div>

		</div>
	</div>


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